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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc50e17a86c4ce2b4a6b5e6be99802da0a9df65d08c502e14e82b0f415874ba3' 
  AND token = 'CEG/uxyduCxVtoRS94uBR405T+j9NMlVkZYPvpPLBtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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