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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288714f931fb77fd166c8c6cd53c0663f858552fc5d9f08014968e87797cdcff' 
  AND token = '1c9ApRXRkpCYQYYTAKMjSN7xYKXgKjO27CcesuvAfE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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