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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6467fd4d94ab90eccf84432b68c31f97b37228ddd13714119de7eed38e254ba8' 
  AND token = 'vrKdS8sDNzYEUyUC+43Xgbs9BoAjp+AO8cYBLBPeygs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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