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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7499bb60b880d600d6b483f8a777de8c999b579a280c1bc8c361112b7faa19c4' 
  AND token = 'StdcbKNRxJ9gq1JXS3FJG+E7Tpe74TmH+fC2RUtJdTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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