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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01fd70623d98e7cace34b3d471ff9122047aa395bec72923e42f770517640b9d' 
  AND token = 'Ccum1UvrIsmCgsNBF2jbMJoVPlUGGp1U91ftpd6viZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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