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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fda072d83fe53ce5c9ffb2e929a291d02a423e9e55200643bbc3c79e8dd8cd' 
  AND token = '2uY/Lba8K49+nE7nFHfSoDuVq3/deS9hfLkWRpBHs1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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