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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b610b095e5c117c1c6fec0311346be3a56f1c36dc97bc8e8ba051e0cb448f66' 
  AND token = '1RyjkAZbgZPgWeClwK9bDjqeIfBhHzlCf+iLDelOrxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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