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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '746400889017d8e5f6619d98f7ee22a6fc35a606c99f6978001aea564950ea0a' 
  AND token = 'WhasdO3AZIubV7ds+U1L8B8avuRsOFbtRT7mOUKVeFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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