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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ef44ed24dda6e24605ce44dea1bee8e657ec8a4755bf46a76b8eae14d9276a' 
  AND token = 'gMYoB28fM/9XFtuttDHB0qXs0O/vY2Ms/jYnAedkhWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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