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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '638e5b0bea2a65c7ff6ed7fda29e12b16238fea4634089f66a72154ececc3ed6' 
  AND token = '1V/0RLWG2AWgEUnT+J2DL0p7G4x3f4D0Gm7zpRv3uBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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