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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3050d7db3685d4d117ad741ff79c51885a69898de7c6109a8c406657036e44ee' 
  AND token = 'K08h6/5m24T3WjRMzDuZBH4qL/RmiGMES8gXGELcKmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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