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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7348ed119211bb7d09acf9b97bbe2667cb0b1ee960f3d319db073daff6e4b97' 
  AND token = 'CqPqW+W6Yatk4n3HQdBXBn0zVNYXMw2JgKa13SIx2xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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