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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df0607b7e7fe580d7e82b6324561a660632bd60b130742099a315a21e6de4b71' 
  AND token = 'hRwWkf20NSJScgiQWVy6BCbwX6KJg83mLNd1WHX87V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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