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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e213375d4a3f354582646d2e1a0c909c24b020e81be12c911148537a9679790e' 
  AND token = 'd/jmiitmBmLS7NLYR9z1kc0ktrGlZb1DQYbTDc/xbnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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