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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c76175a518260264b4ece58f0a5958bc66fc639f6ca5d78aa392d42190bc447' 
  AND token = 'ZCH8HG8Sr62CUix3o87LV+HTQDs9O7X9SsMJhQuTrL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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