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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1e37e33b6b84841b16450efe814087c3b8922bd5df9751073c516355424a105' 
  AND token = 'iY+4Tn3b2m9ttOp4qnNNfhFeFIuQhnt3Aq+kgvOaMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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