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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90b786465c281f59524961673df1f6cd172c51b7302788b5b046b942f48d158' 
  AND token = 'KBmaX+4KHDsjTCy3cAvFezjHbemAr/e843SGEIydVEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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