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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af3e18e6ef49e1a830224d0b3894cf0153ae8707c800ba4f9b6b4f0d1a99c02' 
  AND token = 't9Fw8pBbF2cg3X78Tgpj04wUDdw8u02il4IKXztqCkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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