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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d56c73575957ae984d944f40070ca23d4ff47c36c17820b12a09866a574b03f' 
  AND token = 'AElTr1AHRZa0gx2ZZ/h0mJwxWnno63ckMW1IGtPduZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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