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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d803601c656f89089ceb1014fff5217d996f89ba75f7bd6d55ab2f1e92f8569' 
  AND token = 'nQxIS4wbY/LMceo0IxWq4vBVDLX0yDmQGQm06c+/nrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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