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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0566350327f6da32faeca827ffc8cf7806f6bb4a30cdd0b9b7be1b9be8178aa6' 
  AND token = '2Ny2fEn3RkU/fQrapmd6Xu2iN+pCs56cHJONQgiFZfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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