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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be86f9d5af7428514a452276e8b50519a316535597912a0dbb22614d6d0e560e' 
  AND token = 'LV+kQzE8lNQ+uBL0GQXCsRScIg4LziOton91Y7+MSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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