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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c622a924cceb548bc8860be6e8c7bbc9ff75564b410dec308aaf5c7cec7a936b' 
  AND token = 'PLozNxfXQ92aQbt6fsnuku3yrJ7i2AdupKs67oSmtuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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