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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a50c22cb6ccb5cf7d9b3b88d6c9a2865173c8fde043e3e217be6a4c63a482e57' 
  AND token = 'gz7eQetU/AAjq2cFvUfedRywEYU79f0MEnQS7XajMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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