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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6bfa360ef64c1c142d7627dde3c071d4fbf35062823b137ff97be592af8c53' 
  AND token = 'GXyqrHAeSmbPx+U4QhIn6M8Q+bhLR4QGPC+vk2GQ0dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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