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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fad8a941ae095a03473fe70649e900a0071c090c5c5566b73de82fdd6e5a572' 
  AND token = 'SmGCvkOr/8DJ8/Tx8wgz8iyFEjNrV3ruYk4n3MKq8ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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