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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2562203c61309a588c772464e3068a9c0c1488e738e1bd8780f991e92f68355' 
  AND token = 'f/5PDi9HMF2sOJEgd4VLrs6CU2zHYrDCEJci18MR6+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}