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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfe42a7e7b190657b483c4c1b1acc360bb1a955e1262b173b6d24b75b94fe61' 
  AND token = '1ZP5hhIkIflkqt8+PPpSRyKoQpnW8aUNV18zixHUgxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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