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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26f40027bdc848ddb8a204456e4a8fe1cf0090f117ef58a687979e676afe5b87' 
  AND token = 'Mo++hY1aS6iCf41CPZ5dE+K9qEmjaw+65T6xbBWH3Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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