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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96241e8358b29755b007b54d18c1cebe59e1b28960a2d94509244e1a2ac5184e' 
  AND token = 'n6ByJp0ldzUJhCwznGmZ5pCWWBY1ziTKc//r+R5y8XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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