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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7733796f3f31479769544da38191cef0f6c3c73a6c3a2a7d1c67cf9df7d1a34' 
  AND token = 'v5MEJVE6eFO49YwYLl47hu2QIt6Pfb8lvVpM7pvl/t4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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