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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c3e7b51eb1757804d3e2cb15186055916ed6b1d3b3bc4f1732e85b05491d2a8' 
  AND token = 'sjdRHRAByIN0Eny2IMc/8zeJRziEbI9pmuHHFs3Fu30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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