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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2dfa369c43a5f0f552f9bf325075752398c6507adea2da8f4ce291e826efd0c' 
  AND token = 'R9dqe7hbmSfvTF3FKFRaTNMJqo/AiJP2hygg9sd870s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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