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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985a9c538774a0786ddb9a42aa85574712ddd98a4bf58f4af3b5c92039abeb9b' 
  AND token = 'UP3Ai1a/PFb7p942r+zFXUPQ2BFyN/T3iiKwmPR7V9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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