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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7d3016ce129bee4f2690785a13627e3d70562f748ef361c01e87088bd4da86d' 
  AND token = '/4rcVHi7EqwGshvVr2hlauOYM/VtFtiAK1vu6Kdk/9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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