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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f674f008043a1241756bed2e3e6f067c3c61197f3fbd52a94cfdfa0be68b72' 
  AND token = 'Mrg84qGbYoGEwPNLILgsI9u+0qad66+iZCVqcFzOtpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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