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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44f39cdabcf6b8647b8698204bc10f4e25b1c05c0565c1d0df71fcf053f0b68' 
  AND token = 'W9F2Tv83mICOw5AoCDfx4G4ElT1uh+sjC6H1u1SwO4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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