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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f26741c7d2049079ed3e528fa3456da06db51d5a04e443adc7dabf4de13987' 
  AND token = 'WdHpvd66+ZvqCM2UE0Rtvyxrg6AIwCJL/c0Al4u+LCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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