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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf14115071859d7846a08758aaf3e4213dc4b0d657bb33c3645a083dfdc3492' 
  AND token = '4GauY4G+efTfPYDk9KanaXsqCoUepeDXs15CQ6s9QSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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