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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775e77e5bd5c16d13daa5f8d91db4b6b5e7f0ccf645e1a47e3136cd990b328e1' 
  AND token = 'c8mFqCftFu2ynpcC4hhWGJ0Khgbeiw3sVhaqQHnKve0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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