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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8facf00cb5e1975493952fdb8b28ed68ebe4a61814eae85124a86e367cd4384e' 
  AND token = '4xifgDwHf0ey85czJ537NJqNulOGQQ/Y+imLueaSen4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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