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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '017141edb374c5cb66fed45d7e1fcb7a51a967b8390785132c24dcbf35ffc364' 
  AND token = '5lL9mx9C6njilGKkNly3KNQ+0YQ5F6kYtDmV1LlHOl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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