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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee79ce9dce459eec8b8246d5cce67c9d4662f59c74d6deb3815f75e8785fe2b' 
  AND token = 'WkqLusnWaPxqmFPW+FY+eq+ofVhfZiAui9GM+iAHd5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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