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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4417dda00e31ef59c1ba2f134e16bc94f97b69c80113db35ea9b31d001142e44' 
  AND token = 'VBrcZ5Afeyhv/dodGp+bBTXwDkeKl1bzsJjqSwl6e+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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