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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c0d324d103943b4db329645794d7e1b09399e831e657cd2a3bcb1868b298e4d' 
  AND token = 'dFeYbcjTIB+PF8U707MS9s9DPQKRP29Ov0GdmfvBNIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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