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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcdb19622dcb0f498fb76a3e84cefcca163fa4b007e2724c5b87a6c4cc85bea' 
  AND token = 'Nf6vJ6liqrC02T7UwmWYOSXhRAT5OSLvV4E5e65vyVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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