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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cc1bafd6a6e841c906b93cff409abd4396bab089053b50dfea4d1986b63a4c3' 
  AND token = 'XtVfyOy4OnFAlGTq1SZ1xbu5qhighskMOQY3JKVxFKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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