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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5839dad990e963970ef331a23b704f2d44b80ed802d6de5922bd9e05c84cde31' 
  AND token = '0lF0TFpSOtaREBDIw1M3Lau0kMvUmn2MUgJ8WxlVhq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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