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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96d6f9ece0ae988354bb76c0a8dbef7ea418837513bd40dfa0b1cf3eb3850961' 
  AND token = 'ikEhoE7Kno+WZzmu6uDC7VTBSrb8SNXRX+DQaFg2xSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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