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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59a04c673a513a6e7fe6b2b1503ce81bd8c0937696781194e2035fdd6255524' 
  AND token = '0aERA9jdECemXCZl399zwHWXqXjFl239GwgW7up+hAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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